CA2028791A1 - Telephone system - Google Patents
Telephone systemInfo
- Publication number
- CA2028791A1 CA2028791A1 CA2028791A CA2028791A CA2028791A1 CA 2028791 A1 CA2028791 A1 CA 2028791A1 CA 2028791 A CA2028791 A CA 2028791A CA 2028791 A CA2028791 A CA 2028791A CA 2028791 A1 CA2028791 A1 CA 2028791A1
- Authority
- CA
- Canada
- Prior art keywords
- isdn
- speech signal
- signal level
- gain
- pstn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/253—Telephone sets using digital voice transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/40—Applications of speech amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
- H04M9/008—Multiplex systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/005—Interface circuits for subscriber lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/0096—Trunk circuits
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Interface Circuits In Exchanges (AREA)
Abstract
In a key telephone system connectable to both ISDN and PSTN, for the purpose of compensation of a difference in speech signal level between ISDN and PSTN, digital pads are incorporated in an ISDN interface unit mounted on a key service unit of this system. In the digital pads, original PCM-code speech signals received/transmitted from/to the ISDN line are converted into PCM-code speech signal with a compensated speech signal level obtained by adding a selected gain to the original speech signal level. Since the difference in the speech signal level between ISDN and PSTN differs according to the conditions, an appropriate gain is selected from a plurality of previously prepared gains.
That is, the relationship between telephone numbers and information signals indicative of the selected gain is registered in the key service unit. Therefore, when conversation is made to a subscriber whose telephone number has been registered through the ISDN, a gain registered in correspondence to the subscriber's telephone number can be selected automatically.
That is, the relationship between telephone numbers and information signals indicative of the selected gain is registered in the key service unit. Therefore, when conversation is made to a subscriber whose telephone number has been registered through the ISDN, a gain registered in correspondence to the subscriber's telephone number can be selected automatically.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP01282163A JP3085676B2 (en) | 1989-10-30 | 1989-10-30 | Telephone equipment |
JP282163/1989 | 1989-10-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2028791A1 true CA2028791A1 (en) | 1991-05-01 |
CA2028791C CA2028791C (en) | 1994-06-28 |
Family
ID=17648922
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002028791A Expired - Lifetime CA2028791C (en) | 1989-10-30 | 1990-10-29 | Telephone system |
Country Status (3)
Country | Link |
---|---|
US (1) | US5070524A (en) |
JP (1) | JP3085676B2 (en) |
CA (1) | CA2028791C (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5515430A (en) * | 1990-08-28 | 1996-05-07 | Canon Kabushiki Kaisha | Volume controller |
EP0836351A3 (en) * | 1990-11-29 | 1999-06-02 | Fujitsu Limited | ISDN interface unit |
JPH04208742A (en) * | 1990-12-04 | 1992-07-30 | Canon Inc | Speech level adjusting device |
JP2744357B2 (en) * | 1991-04-23 | 1998-04-28 | キヤノン株式会社 | Private branch exchange |
JP2752856B2 (en) * | 1991-08-12 | 1998-05-18 | インターナショナル・ビジネス・マシーンズ・コーポレイション | Telephone service integration device and communication adapter |
US5495529A (en) * | 1992-11-26 | 1996-02-27 | Nec Corporation | Digital sound level control apparatus |
US5471527A (en) | 1993-12-02 | 1995-11-28 | Dsc Communications Corporation | Voice enhancement system and method |
EP0677975B1 (en) * | 1994-03-16 | 2002-07-17 | Siemens Aktiengesellschaft | Method for putting into operation an interface allocatable to different transmission links in a program controlled communication system |
FR2733868B1 (en) * | 1995-05-03 | 1997-07-04 | Alsacienne Et Lorraine De Tele | ADAPTABLE MODULAR DEVICE FOR INTERCONNECTING OR COMMUNICATING DIFFERENT LOCAL COMPUTER AND / OR COMMUNICATION DEVICES OR NETWORKS AND A METHOD IMPLEMENTING THIS DEVICE |
KR0184472B1 (en) * | 1995-11-30 | 1999-05-15 | 김광호 | Multi-subscriber implementation method in keyphone system |
KR100222433B1 (en) | 1997-02-28 | 1999-10-01 | 윤종용 | Configuration method of network interfacing circuits in isdn key telephone system |
KR100520161B1 (en) * | 1998-12-30 | 2005-11-24 | 삼성전자주식회사 | Coding conversion circuit between local exchange and ISDN key phone system |
SE514793C2 (en) * | 1999-05-31 | 2001-04-23 | Ericsson Telefon Ab L M | Procedure and system for line level adjustment between networks |
US20020087990A1 (en) * | 2000-12-05 | 2002-07-04 | Jim Bruton | System for transmitting data via satellite |
TW574819B (en) * | 2002-05-23 | 2004-02-01 | Chen Wu Tien | Wireless digital key telephone system |
JP4586330B2 (en) * | 2002-12-27 | 2010-11-24 | 沖電気工業株式会社 | Voice communication apparatus and voice communication system |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62214799A (en) * | 1986-03-14 | 1987-09-21 | Iwatsu Electric Co Ltd | Telephone system |
JPS6324787A (en) * | 1986-07-16 | 1988-02-02 | Nec Corp | Key telephone system |
KR880009375A (en) * | 1987-01-17 | 1988-09-15 | 강진구 | Seamos address buffer |
JPH07110070B2 (en) * | 1989-06-08 | 1995-11-22 | 松下電器産業株式会社 | Digital pad insertion method for ISDN network / terminal |
-
1989
- 1989-10-30 JP JP01282163A patent/JP3085676B2/en not_active Expired - Lifetime
-
1990
- 1990-10-29 CA CA002028791A patent/CA2028791C/en not_active Expired - Lifetime
- 1990-10-30 US US07/605,411 patent/US5070524A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US5070524A (en) | 1991-12-03 |
JP3085676B2 (en) | 2000-09-11 |
CA2028791C (en) | 1994-06-28 |
JPH03143190A (en) | 1991-06-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed | ||
MKEC | Expiry (correction) |
Effective date: 20121202 |